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Mechanical Engineering
Strength Of Materials In ME
Quiz 15
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Q.1
Modular ratio of two materials is the ratio of
Strains
Stress and strain
Shear stress and shear strain
Moduli and elasticity
Q.2
The given figure shows the Mohr's circle of stress for two unequal and like principal stresses (σx and σy) acting at a body across two mutually perpendicular planes. The normal stress on an oblique section making an angle θ with the minor principle plane is given by
OC
OP
OQ
PQ
Q.3
The property of a material which allows it to be drawn into a smaller section is called
Plasticity
Ductility
Elasticity
Malleability
Q.4
If the radius of wire stretched by a load is doubled, then its Young’s modulus will be
Doubled
Halved
Becomes four times
None of the above
Q.5
For which material the Poisson's ratio is more than unity
Steel
Copper
Aluminium
None of the above
Q.6
The value of modulus of elasticity for mild steel is of the order of
2.1 × 10⁵ kg/cm²
2.1 × 10⁶ kg/cm²
2.1 × 10⁷ kg/cm²
0.1 × 10⁶ kg/cm²
Q.7
Shear strength of the welded joint for double parallel fillet is (where τ = Allowable shear stress for weld metal)
0.5 s.l.τ
s.l.τ
√2 s.l.τ
2.s.l.τ
Q.8
The tensile strength of the welded joint for double fillet is (where s = Leg or size of the weld, l = Length of weld, and σt = Allowable tensile stress for weld metal)
0.5 s.l.σt
s.l.σt
√2 s.l.σt
2.s.l.σt
Q.9
A thin cylindrical shell of diameter (d), length (l) and thickness (t) is subjected to an internal pressure (p). The hoop stress in the shell is
pd/t
pd/2t
pd/4t
pd/6t
Q.10
A thin cylindrical shell of diameter (d) length (l) and thickness (t) is subjected to an internal pressure (p). The longitudinal stress in the shell is
pd/t
pd/2t
pd/4t
pd/6t
Q.11
Shear modulus is the ratio of
Linear stress to linear strain
Linear stress to lateral strain
Volumetric strain to linear strain
Shear stress to shear strain
Q.12
Rupture stress is
Breaking stress
Maximum load/original cross-sectional area
Load at breaking point/Area
Load at breaking point/neck area
Q.13
The relation between Young's modulus (E) and bulk modulus (K) is given by
k = (3m - 2)/m.E
k = m.E/(3m - 2)
k = 3(m - 2)/m.E
k = m.E/3(m - 2)
Q.14
The relation between Young's modulus (E), shear modulus (C) and bulk modulus (K) is given by
E = 3K.C/(3K + C)
E = 6K.C/(3K + C)
E = 9K.C/(3K + C)
E = 12K.C/(3K + C)
Q.15
Lame's theory is associated with
Thin cylindrical shells
Thick cylindrical shells
Direct and bending stresses
None of these
Q.16
The assumption made in the theory of the reinforced cement concrete beam is that
All the tensile stresses are taken up by the steel reinforcement only
There is a sufficient bond between steel and concrete
The steel and concrete are stressed within its elastic limit
All of the above
Q.17
Fatigue test is carried out for
Stresses varying between two limits of equal value, but of opposite sign
Stresses varying between two limits of unequal value, but of opposite sign
Stresses varying between two limits of unequal value but of same sign
All of the above
Q.18
The change in length due to a tensile or compressive force acting on a body is given by (where P = Tensile or compressive force acting on the body, l = Original length of the body, A = Cross-sectional area of the body, and E = Young's modulus for the material of the body)
PlA/E
Pl/AE
E/PlA
AE/Pl
Q.19
Young’s modulus of a wire is defined as the stress which will increase the length of wire compared to its original length by
Half
Same amount
Double
One-fourth
Q.20
In order to avoid tearing off the plate at an edge, the distance from the center of the rivet hole to the nearest edge of the plate (i.e. margin) should be (where d = Diameter of rivet hole in mm)
d
1.5 d
2 d
2.5 d
Q.21
It equal and opposite forces applied to a body tend to elongate it, the stress so produced is called
Transverse stress
Internal resistance
Tensile stress
Compressive stress
Q.22
In the below figure, Hook's law holds good, for the portion from_________.
O to A
B to D
D to E
None of these
Q.23
In the below figure, the point C represents
Elastic limit
Upper yield point
Lower yield point
Breaking point
Q.24
In the below figure, the plastic range occurs
Before point A
Beyond point A
Between points A and D
Between points D and E
Q.25
In a stress-strain diagram for mild steel, as shown in the below figure, the point ‘A’ represents
Elastic limit
Upper yield point
Lower yield point
Breaking point
0 h : 0 m : 1 s
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